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Acceptance rate measures the percentage of emails accepted by receiving mail servers without bouncing. Unlike deliverability rate, acceptance rate includes all non-bounced emails regardless of whether they reach the inbox or spam folder. A high acceptance rate indicates your emails pass initial server-level checks but does not guarantee inbox placement.
Acceptance rate serves as the first checkpoint for email deliverability. A low acceptance rate means your emails are being rejected outright, which damages sender reputation and wastes resources. Email providers track acceptance patterns to determine sender trustworthiness. Consistently low acceptance rates can lead to blacklisting and further delivery problems. Monitoring acceptance rate helps identify issues with email authentication, list quality, or sending infrastructure before they escalate.
When you send an email, the receiving mail server performs initial checks before deciding to accept or reject the message. These checks include verifying sender authentication (SPF, DKIM, DMARC), checking IP reputation, and validating the recipient address exists. If the server accepts the email, it counts toward your acceptance rate. If rejected, the email bounces. After acceptance, the server then decides whether to deliver the email to the inbox, spam folder, or other locations based on content and engagement signals.
A healthy acceptance rate is 95% or higher. Rates below 90% indicate significant delivery problems that need immediate attention. Top senders typically achieve 97-99% acceptance rates through proper list hygiene and authentication.
Acceptance rate measures emails accepted by servers without bouncing. Deliverability rate measures emails that actually reach the inbox. An email can be accepted but still land in spam. Acceptance rate is typically higher than deliverability rate because it includes spam folder placement.
Common causes include expired email addresses, blacklisting, authentication failures, or sending to a list with many invalid addresses. Check your bounce reports, verify authentication records, and review recent list additions for quality issues.
Start by verifying your email list to remove invalid addresses. Ensure SPF, DKIM, and DMARC are properly configured. Monitor bounce rates and remove addresses that consistently fail. Consider warming up sending IPs if you recently changed providers.
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